CombineUnions Logical Optimization

CombineUnions is a base logical optimization that FIXME.

CombineUnions is part of the Union once-executed batch in the standard batches of the Catalyst Optimizer.

CombineUnions is simply a Catalyst rule for transforming logical plans, i.e. Rule[LogicalPlan].

// FIXME Demo

Executing Rule — apply Method

apply(plan: LogicalPlan): LogicalPlan
apply is part of the Rule Contract to execute (apply) a rule on a TreeNode (e.g. LogicalPlan).


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